Linux command: grep - Global Regular Expression Print

grep command

grep, egrep, fgrep, rgrep - print lines matching a pattern

Using grep to view/display content of /etc/rsyslog.conf file without comment lines

$ grep ^[^#] /etc/rsyslog.conf

Using ls and grep to list disks and partitions

$ ls /dev | grep '[s|v|x]d$*'
sda
sda1
sda2
sda3
sda4

--invert-match

grep -iv 'that' file.txt : Show lines that do not contain'that'

egrep - keep only those lines which have at least one of the following words: the, that, then, those.

egrep -iw 'the|that|then|those'

Use 'egrep' or 'grep -E'

egrep 'the|that|then|those'
grep -E 'the|that|then|those'

Extract lines with exactly 11 characters

grep -E "^.{11}$" /usr/share/wordlists/rockyou.txt > /usr/share/wordlists/rockyou-11.txt

Practice

THM | Regular Expressions

Other resources about grep

GNU Grep 3.5

Metasploit Framework: Notes

"The Metasploit Framework contains a suite of tools that you can use to test security vulnerabilities, enumerate networks, execute attacks, and evade detection."

lastlog command reports the most recent login of all users or of a given user. NAME lastlog - reports the most recent login of all users or of a given user SYNOPSIS lastlog [options] DESCRIPTION lastlog formats and prints the contents of the last login log /var/log/lastlog file. The login-name, port, and last login time will be printed. The default (no flags) causes lastlog entries to be printed, sorted by their order in /etc/passwd. OPTIONS The options which apply to the lastlog command are: -b, --before DAYS Print only lastlog records older than DAYS. -h, --help Display help message and exit. -R, --root CHROOT_DIR Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory. -t, --time DAYS Print the lastlog records more recent than DAYS. -u, --user LOGIN|RANGE Print the ...

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